When make credit note, show only these stock items in stock list to select item, which is available in that invoice. Is it possible? For example... " A" , "b" & "c" this 3 items sold in Invoice no 001.. item "b" is returned. When we make credit note for this item "b", then show only items sold in Invoice 001 (means " A" , "b" & "c") instead of all items.
